JPH11256624A - Water distribution equipment and its controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of water by providing a water supply pump, a return water pipe, a pressure gauge, a flow rate adjusing valve, etc., in a piping system distributing water from a distribution basin (water reservoir) to respective houses so as not to stagnate water in the pipes even in the case of a little use of water. SOLUTION: A pressure measured by a terminal end pressure gauge 6 and a pressure measured by a delivery pressure gauge 4 are input in a controller 10, and a flow rate is operated on the basis of both pressures and a target delivery pressure to control the pump 2 so as to make the terminal pressure constant. At the same time, the return water flow rate measured by a return water flow rate meter 7 and a target return water flow rate are input in the controller 10 and a return water flow rate is operated on the basis of the target value to control an inflow adjusting valve 8 and control the return water and always secure a specified water flow rate in the pipes 9 not to stagnate water. A plurality of water reservoirs are formed and water may be forced to flow back after a certain time. In this way, dust is prevented from sticking on the pipe inside and deterioration of water can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water distribution system for supplying water from a reservoir to a customer by a pipe, and a water distribution control device therefor.

[0002]

2. Description of the Related Art The flow of water supply in a conventional water distribution facility will be described with reference to the flow diagram of water supply in FIG. As shown in the figure, the flow of the conventional water supply is from a reservoir 21 to a sewer (water pipe).
27 is one direction to the customer 25. For this purpose, a pump 22, a check valve 23, a pressure gauge 24 and the like are provided in the sewer 27. Water distribution is controlled based on the pressure of the pressure gauge 24 of the pipe. In this case, the pressure Pv detected by the pressure gauge 24 is input to the control controller 26, and an opening signal Sv indicating the opening of the pump 22 is given to the pump 22 based on the detected pressure Pv, and the water distribution control is performed. Is configured to be performed. However, when the amount of water used by the customer 25 decreases, water may stagnate in the pipe at the end of the sewer.

[0003]

As described above, in the one-way water distribution method from the reservoir to the customer, the area where the amount of water used is small or the difference in population between day and night is severe, for example, the area such as an office district In such a case, the amount of water used may decrease drastically depending on the time of day, and the water in the sewer may stagnate, causing deterioration of the water.
Further, when water in the sewer stagnates, dust and the like easily adhere to the inside of the pipe. In such a case, there is a problem that it is impossible to supply clean water to consumers, which is the original purpose of the water supply.

[0004] The present invention (corresponding to claims 1 to 4)
The present invention has been made to solve the above problems, and has as its object to provide a water distribution facility and a water distribution control device that always allow appropriate water to flow in a sewer to prevent adhesion of dust and the like in the pipe. Is to do.

[0005]

According to a first aspect of the present invention, there is provided a water distribution system for supplying water from a reservoir to a customer by a pump via a pipe, wherein the customer has A pipe is provided for returning unused wastewater to the distribution reservoir, and a control valve capable of adjusting a flow rate is provided in the pipe.

According to a second aspect of the present invention, there is provided a sewer which supplies water from a reservoir to a customer by a pump through a sewer and returns waste water not used by the consumer to the reservoir. A water distribution control device for water distribution equipment having a control valve capable of adjusting a flow rate in the sewer, wherein a discharge pressure gauge for detecting a discharge pressure at the outlet of the reservoir, and a flow meter for detecting a flow rate of return water to the reservoir. And a terminal pressure gauge for detecting a terminal pressure of the sewer, and performing a terminal pressure constant control based on the terminal pressure, the discharge pressure, and a discharge pressure target value, and the return water flow rate and the return water flow target value. And a controller for performing constant control of the return flow rate to the distribution reservoir based on the control information.

According to the first and second aspects of the present invention, of the water supplied from the reservoir to the customer, waste water not used by the customer is returned to the reservoir, and the terminal pressure on the water supply side is reduced. The pump is operated by the constant control, and an open / close command is output to the control valve by the constant inflow amount (return amount) control on the return water side. By combining these two controls, a constant flow rate is always ensured in the sewer, and it is possible to prevent water quality deterioration due to stagnation of water.

According to a third aspect of the present invention, there is provided a water distribution system comprising: a first pipe for supplying water from a first reservoir to a customer by a first pump; and a second pump for returning water not used by the customer. Therefore, a second conduit to return to the second reservoir is installed.

According to a fourth aspect of the present invention, there is provided a first conduit for supplying water from a first reservoir to a customer by a first pump, and a second pump for returning water not used by the customer by a second pump. In a water distribution control device for a water distribution facility provided with a second conduit returning to a reservoir, a discharge pressure gauge for detecting a discharge pressure at an outlet of the first reservoir and a terminal pressure gauge for detecting a terminal pressure of the first conduit. An inlet pressure gauge for detecting an inlet pressure at the inlet of the second reservoir, and a terminal pressure constant control based on the terminal pressure, the discharge pressure, and the inlet pressure, and a first and a second at a constant time interval. A control controller is provided for controlling the switching of each of the pumps to reverse the direction of the water flow in the sewer.

According to the third and fourth aspects of the present invention, the first
Returned water not used by the customer among the water supplied from the reservoir to the customer is returned to the second reservoir, and the pump is switched and operated every certain time to reverse the water. Since the switching control of the pump is smoothly performed by the control controller while the terminal pressure is kept constant, it is possible to prevent water quality deterioration due to stagnation of water.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a water distribution facility and a water distribution control device thereof according to a first embodiment (corresponding to claims 1 and 2) of the present invention.

As shown in FIG. 1, in this embodiment, the number of reservoirs is one.
In this case, the supply water is supplied from the reservoir 1 to the customer 5 via the pump 2, the check valve 3, and the discharge pressure gauge 4 by the pipe 9, and then returned to the flow meter 7, the inflow control valve 8 , And returns to the original reservoir 1 again. 6 is a terminal pressure gauge and 10 is a control controller.

Next, the operation of this embodiment will be described.
The terminal pressure Pb measured by the terminal pressure gauge 6 and the discharge pressure Pa measured by the discharge pressure gauge 4 are input to the controller 10. In the controller 10, the terminal pressure P
Calculation is performed based on b, the discharge pressure Pa, and the discharge pressure target value Po, and a signal S1 to the pump 2 is issued so as to keep the terminal pressure of the pipe 9 constant, thereby performing terminal pressure constant control. At the same time, on the feedwater return side, the return water flow rate Fb and the return water flow target value Fbo measured by the return water flow meter 7 are controlled by the controller 1.
Input to 0. The controller 10 performs calculations based on the return water flow rate Fb and the return water flow target value Fo, outputs an open / close command S2 to the inflow control valve 8, and performs constant flow rate control.

As described above, according to the present embodiment, the two controls of the constant end pressure control by the pump 2 and the constant flow rate control by the inflow control valve 8 are performed, and the flow rate of the return water to the reservoir 1 is controlled. . Therefore, a constant flow rate is always ensured in the pipe 9 and it is possible to prevent water quality deterioration due to stagnation of water. Further, by adding chlorine to the return water, deterioration due to stagnation of water can be prevented.

FIG. 2 is a configuration diagram of a water distribution facility and a water distribution control device according to a second embodiment (corresponding to claims 3 and 4) of the present invention. As shown in the figure, in this embodiment, the reservoir is 2
In this case, the flow of the feedwater is first supplied in the Fa direction, that is, from the reservoir 11a to the pump 12a, the check valve 13a, the pressure gauge 14a, and the customer 15 by the pipe 20, and then the return water thereof (waste water). ) To the reservoir 11b via the pressure gauge 14b, the check valve 13b, and the pump 12b.
Next, after a certain time, the flow of the water supply is caused to flow backward in the Fb direction. That is, from the reservoir 11b to the customer 15 via the pump 12b, the check valve 13b, and the pressure gauge 14b by the sewer 20.
, The pressure gauge 14a, the check valve 13a, the pump 1
It reaches reservoir 11a via 2a. 16 is a terminal pressure gauge, 1
Reference numeral 7 denotes a control controller including a check valve opening / closing determination unit 18 and a calculation unit 19.

Next, the operation of this embodiment will be described.
Here, for example, it is assumed that water flows from the reservoir 11a in the direction of Fa, and after a certain time, the flow of water is changed from the reservoir 11b to F
It is assumed that the current flows backward in the direction of b.

First, the rotation speed R2 of the pump 12b is operated to a certain rotation speed, and the discharge pressure P3 of the discharge pressure gauge 14a is increased.
Is established, the check valve 13a is gradually opened by the command S5. Thereafter, the pump 12a is rotated at a rotation speed R so that the terminal pressure P4 measured by the terminal pressure gauge 16 is kept constant.
The controller 17 of the controller 17 controls the command S3 to reduce the rotation speed 1 and the command S4 to increase the rotation speed of the pump 12b.
To determine.

Next, when the rotational speed R1 of the pump 12a falls below a certain value, it is judged by the judging section 18 of the controller 17 and a close command S5 is outputted to the check valve 13a. When the check valve 13a is fully closed, a stop command S3 is output to the pump 12a. Thereafter, the pump 12b outputs a command S4 for controlling the terminal pressure to be constant.

Further, after a certain time, the flow of water is
The control controller 1 changes from 1a to Fa.
In the above description, the signs of the pump, check valve and discharge pressure gauge are changed from a to b or b to a, P3 is changed to P5, R1 is changed to R2, and S5 is changed to S6. Therefore, the description is omitted.

By performing such control, the pump 1
Switching from the pump 2a to the pump 12b or from the pump 12b to the pump 12a can be performed smoothly.
In the present embodiment, the case of two reservoirs has been described. However, it is clear that the present invention can be applied to the case of three or more reservoirs, and the description thereof will be omitted.

[0021]

As described above, the present invention (Claim 1)
According to claim 2), waste water that is not used by the customer is returned to the reservoir, so that water always flows in the sewer to prevent dust from adhering to the sewer, and this return is also possible. By adding chlorine to water, it is possible to prevent stagnation and deterioration of water.

Further, according to the present invention (corresponding to claims 3 and 4), the flow of water in the conduit connecting the plurality of reservoirs is reversed at regular intervals to thereby allow the water to enter the conduit. This has the effect of preventing the attachment of dust and further preventing the generation of red water.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional water distribution facility.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reservoir, 2 ... Pump, 3 ... Check valve, 4 ... Discharge pressure gauge, 5 ... Consumer, 6 ... Terminal pressure gauge, 7 ... Return water flow meter,
Reference numeral 8: return water amount control valve, 9: sewer, 10: control controller, 11a, 11b: reservoir, 12a, 12b: pump, 13a, 13b: check valve, 14a, 14b: discharge pressure gauge, 15: demand House, 16: Terminal pressure gauge, 17: Control controller, 18: Judgment unit, 19: Operation unit, 20: Sewer, F, Fa, Fb: Direction of water flow.

Claims (4)

[Claims] 1. A distribution system for supplying water from a reservoir to a customer by a pump via a conduit, wherein a conduit for returning waste water not used by the customer to the reservoir is provided. A water distribution system characterized by installing a control valve on the culvert to control the flow rate. 2. A conduit for supplying water from a reservoir to a customer by a pump via a conduit and returning waste water not used by the consumer to the reservoir, and a flow rate in the conduit. In the water distribution control device of the water distribution equipment equipped with a control valve capable of adjusting the discharge pressure gauge to detect the discharge pressure at the outlet of the reservoir, and a flow meter to detect the return water flow rate to the reservoir,
A terminal pressure gauge that detects the terminal pressure of the sewer, and performs terminal pressure constant control based on the terminal pressure, the discharge pressure, and the discharge pressure target value, and based on the return water flow rate and the return water flow target value. A water distribution control device for water distribution equipment, comprising: a control controller for performing constant control of a return flow rate to the distribution reservoir. 3. A first conduit for supplying water from a first reservoir to a customer by a first pump, and a second conduit for returning return water not used by the customer to a second reservoir by a second pump. Water distribution equipment characterized by the installation of a sewer. 4. A first conduit for supplying water from a first distribution reservoir to a customer by a first pump, and a second conduit for returning return water not used by the customer to a second distribution reservoir by a second pump. In the water distribution control device for a water distribution facility provided with a sewer,
A discharge pressure gauge for detecting a discharge pressure at an outlet of the reservoir;
A terminal pressure gauge for detecting a terminal pressure of a sewer, an inlet pressure gauge for detecting an inlet pressure of an inlet of the second reservoir, and a terminal pressure constant control based on the terminal pressure, the discharge pressure, and the inlet pressure. A water distribution control device for water distribution equipment, further comprising: a controller that controls switching of each of the pumps so as to reverse the directions of water flow in the first and second conduits at regular intervals.